Here is the full list of all 44 Chronicle: RuneScape Legends achievements.
Win any game with Morvran.
Open 50 booster packs.
Have a weapon with at least 8 durability.
Win 50 games in any mode.
Open 10 booster packs.
Win a least 3 games in a single dungeoneering run.
Have a weapon with at least 10 attack.
Win any game with Vanescula.
Win any game with Linza.
Craft a card in the collection.
Start a dungeoneering run.
Get promoted to the silver league in ranked.
Reach rank 1 in the ranked bronze league.
Gain rising star in ranked.
Build at least 3 custom decks.
Open a booster pack.
Complete a magic skilling challenge.
Complete an attack skilling challenge.
Complete a smithing skilling challenge.
Complete the gold tier in solo.
Complete the silver tier in solo.
Complete the bronze tier in solo.
Win any game with Ozan.
Unlock all the Legends in the game.
Draw at least 10 cards from effects in a game.
Win any game with Ariane.
Play 10 games in any mode.
Build a custom deck.
Win any game with The Raptor.
Have at least 5 base attack in a game.
Have at least 10 armour in a game.
Complete the tutorial.
Have at least 30 gold in a game.
Have at least 10 base attack in a game.
Complete an entire dungeoneering run.
Win 500 games in any mode.
Get every legend to at least level 25.
Get promoted to the gold league in ranked.
Get promoted to the diamond league in ranked.
Have at least 75 armour in a game.
Have a weapon with at least 20 durability.
Have a weapon with at least 20 attack.
Have at least 15 base attack in a game.
Have at least 150 gold in a game.